ARUnlock (FalcoSoftware)

Hello,I'd like to buy ARUnlock (https://www.falcosoftware.com/xojo/ ).On website, a message says "Buying from here will let you have your personal list of registration key. It will available soon. Actually you can buy the registration keys in the Xojo Add-ons Store". I see some other products of Antonio Rinaldi but not this one.Somebody can help me to buy it ?Best regards.G.A.